[Q] Strange Problem with S2 - Galaxy S II Q&A, Help & Troubleshooting

To start with, my friend bought an S2 from somebody, and it was running stock Android 2.3.4 Gingerbread, if i remember correctly something that ended with KI4. He had one problem: he could not log into his gmail account regardless of what he did so he decided to ask me to update his device. And this is where the fun started:
I tried to update using the OTA feature, but as he couldn't add his google account it didn't work.
Next i tried updating through KIES, but strangly it said that there was no update available.
We decided to root the phone and try installing a custom ROM.
We rooted it with the CF-Kernel and then installed Neat ROM Lite, but the ROM is not important.
After successfully installing it an starting the phone, we were stunned by the image below. The strangest part is that the image is above the wallpaper but under the widgets and when scrolling through home screens in remains there just like the four short cuts below.
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
Also, the home button did not work. From here on i have asked for help from the ROM developer and did the next things
Flashed the official LPX firmware with ODIN. It is worth mentioning that he is able to add his account on any 4.0.x ROm, but other problems appear. In the stock official LPX the home button worked but the strange image was still there.
After this we flashed the Siyah kernel via Odin, did the usual cleaning up like restore to factory settings, clearing every cache, formatting system after which i installed the custom ROM again but with the same results: home button not working and the image was still there.
My questions are:
1.How do i get rid of that bloody image on the stock ROM, since that seemed to be the best one.
2.How do i make the home button work again in the Neat ROM 3.3.
It is also important to mention that i have not yet tried other custom ROMs since i will only get my friends phone tomorrow. I have a feeling that i will have the same problems with other ROMs regardless of their official/custom status. I also remember that somebody had this problem before but i am unable to find that particular post, so if the person who found the solution reads this post please help me too
Thanks in advance.

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Try resetting settings to default.

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przemcio510 said:
Try resetting settings to default.
Click to expand...
Click to collapse
Thanks, but i forgot to mention i already did that

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Then you can give CM10 a try, it's stable enough.

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same problem
radu_wizu said:
To start with, my friend bought an S2 from somebody, and it was running stock Android 2.3.4 Gingerbread, if i remember correctly something that ended with KI4. He had one problem: he could not log into his gmail account regardless of what he did so he decided to ask me to update his device. And this is where the fun started:
I tried to update using the OTA feature, but as he couldn't add his google account it didn't work.
Next i tried updating through KIES, but strangly it said that there was no update available.
We decided to root the phone and try installing a custom ROM.
We rooted it with the CF-Kernel and then installed Neat ROM Lite, but the ROM is not important.
After successfully installing it an starting the phone, we were stunned by the image below. The strangest part is that the image is above the wallpaper but under the widgets and when scrolling through home screens in remains there just like the four short cuts below.
Also, the home button did not work. From here on i have asked for help from the ROM developer and did the next things
Flashed the official LPX firmware with ODIN. It is worth mentioning that he is able to add his account on any 4.0.x ROm, but other problems appear. In the stock official LPX the home button worked but the strange image was still there.
After this we flashed the Siyah kernel via Odin, did the usual cleaning up like restore to factory settings, clearing every cache, formatting system after which i installed the custom ROM again but with the same results: home button not working and the image was still there.
My questions are:
1.How do i get rid of that bloody image on the stock ROM, since that seemed to be the best one.
2.How do i make the home button work again in the Neat ROM 3.3.
It is also important to mention that i have not yet tried other custom ROMs since i will only get my friends phone tomorrow. I have a feeling that i will have the same problems with other ROMs regardless of their official/custom status. I also remember that somebody had this problem before but i am unable to find that particular post, so if the person who found the solution reads this post please help me too
Thanks in advance.
Click to expand...
Click to collapse
Have you found a solution? Please share with me.

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It is due to mising of keystr file under imei folder...root your device->install root explore->locate folder efs/imei->check there is a keystr file if not create a new file by pressing menu button and create new file->name it keystr and edit the file ON->reset your device...
Sent from my GT-I9100 using xda app-developers app

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eswar6280 said:
It is due to mising of keystr file under imei folder...root your device->install root explore->locate folder efs/imei->check there is a keystr file if not create a new file by pressing menu button and create new file->name it keystr and edit the file ON->reset your device...
Sent from my GT-I9100 using xda app-developers app
Click to expand...
Click to collapse
I gonna try your solution. I'll let you know. Thanks.
---------- Post added at 11:41 PM ---------- Previous post was at 11:17 PM ----------
eswar6280 said:
It is due to mising of keystr file under imei folder...root your device->install root explore->locate folder efs/imei->check there is a keystr file if not create a new file by pressing menu button and create new file->name it keystr and edit the file ON->reset your device...
Sent from my GT-I9100 using xda app-developers app
Click to expand...
Click to collapse
what extension should the file have? what do you mean "edit the file on"?

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mess18 said:
I gonna try your solution. I'll let you know. Thanks.
---------- Post added at 11:41 PM ---------- Previous post was at 11:17 PM ----------
what extension should the file have? what do you mean "edit the file on"?
Click to expand...
Click to collapse
No extension.
and by "edit the file on", he meant edit the file to contain the word ON. That's it. And make sure the file has 644 permissions. (rw-r--r--)

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it will work
ctomgee said:
No extension.
and by "edit the file on", he meant edit the file to contain the word ON. That's it. And make sure the file has 644 permissions. (rw-r--r--)
Click to expand...
Click to collapse
Sure,it will work by creating a file with root explorer,rename the file to keystr and writing ON in the file with a text editor